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Chuck-Mate - PRICE: $12.95 OPERATION: Friction fit COUNTERBORE SIZES: 3/S in., 1;' in. Prongs � Sliding collar Cou nterbore Allen-head screw Twist bit The prongs slide over the driver, which is chucked in the drill. A disc is pulled down to hold the counterbore tightly in place. PROS: The Chuck-Mate Is easy to use, and its counterbore cut the fastest and cleanest holes of the group. Although It comes in a wide assortment of drill bits for screws ranging from #3 through #12, I've used a #6 bit almost exclusively for years. The pilot hole and counterbore are The sleeve is then removed and set made in one easy motion. aside to reveal the driver. CONS: The friction fit that holds the bit to the driver has a tendency to vibrate loose when the bit is pulled from the work. The Chuck-Mate's drill bit Is shortened to fit the tool, and any replacement may have to be modified. Another unnerving characteristic is its wobble. Although the wobble doesn't affect the quality of the hole, the action often made my drill vibrate like a palm sander. Also, an Allen wrench Is not included. Insty-Bit Chuck PRICE: $10.95 for chuck $22.95 for set of five bits OPERATION: Drill swapped for driver 3/s in., COUNTERBORE SIZES: 1;' in. Counterbore Allen-head screw Brad-point bit Bit locks into place with a detent on its shank. Pilot hole and counterbore are both drilled in one stroke. Bit is easily removed and replaced With the driver in place, the drill is with a driver. readied for driving screws. Photos: Matthew Teague J U L Y / AUG U S T 1 9 9 8 77